Mine roof warning indicator



FIG. 1 is a prospective view of the mine roof warning indicator showingour new design.

FIG. 2 is a perspective view with the indicator means in the dangerwarning position of the mine roof warning indicator showing our newdesign.

FIG. 3 is a top view of the mine roof warning indicator showing our newdesign.

FIG. 4 is a bottom view of a mine roof warning indicator showing our newdesign.

The ornamental design for a mine roof warning indicator, as shown.